[PULL v2 10/41] hw/hexagon/virt: instantiate virtio-mmio transports

[Brian Cain]

Add a VIRT_MMIO region and virtio-mmio transports, wired into l2vic.

Reviewed-by: Philippe Mathieu-Daudé <phi...@oss.qualcomm.com>
Link: 
https://lore.kernel.org/qemu-devel/20260806042723.3785369-11-brian.c...@oss.qualcomm.com
Signed-off-by: Brian Cain <brian.c...@oss.qualcomm.com>
---
 include/hw/hexagon/virt.h |  3 +++
 hw/hexagon/virt.c         | 28 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/include/hw/hexagon/virt.h b/include/hw/hexagon/virt.h
index cf0cd2f8f22..4ca2f1ef859 100644
--- a/include/hw/hexagon/virt.h
+++ b/include/hw/hexagon/virt.h
@@ -11,6 +11,8 @@
 #include "hw/hexagon/hexagon.h"
 #include "target/hexagon/cpu.h"
 
+#define VIRTIO_DEV_COUNT 8
+
 struct HexagonVirtMachineState {
     HexagonCommonMachineState parent_obj;
 
@@ -19,6 +21,7 @@ struct HexagonVirtMachineState {
     MemoryRegion tcm;
     MemoryRegion bios;
     Clock *apb_clk;
+    DeviceState *virtio_mmio[VIRTIO_DEV_COUNT];
 };
 
 void hexagon_load_fdt(const struct HexagonVirtMachineState *vms);
diff --git a/hw/hexagon/virt.c b/hw/hexagon/virt.c
index 9a680852c3c..ff0770cfc46 100644
--- a/hw/hexagon/virt.c
+++ b/hw/hexagon/virt.c
@@ -30,11 +30,19 @@
 
 enum {
     VIRT_UART0,
+    VIRT_MMIO,
     VIRT_FDT,
 };
 
+/*
+ * Virtio IRQs run from VIRTIO_IRQ_BASE to
+ * VIRTIO_IRQ_BASE + VIRTIO_DEV_COUNT - 1
+ */
+static const int VIRTIO_IRQ_BASE = 16;
+
 static const MemMapEntry base_memmap[] = {
     [VIRT_UART0] = { 0x10000000, 0x00000200 },
+    [VIRT_MMIO] = { 0x11000000, 0x00001000 },
     [VIRT_FDT] = { 0x99800000, 0x00400000 },
 };
 
@@ -167,7 +175,25 @@ static void fdt_add_cpu_nodes(const 
HexagonVirtMachineState *vms)
     }
 }
 
+static void create_virtio_devices(HexagonVirtMachineState *vms)
+{
+    hwaddr size = base_memmap[VIRT_MMIO].size;
 
+    for (int i = 0; i < VIRTIO_DEV_COUNT; i++) {
+        int irq = VIRTIO_IRQ_BASE + i;
+        hwaddr base = base_memmap[VIRT_MMIO].base + i * size;
+        DeviceState *dev = qdev_new("virtio-mmio");
+        SysBusDevice *s = SYS_BUS_DEVICE(dev);
+
+        object_property_add_child(OBJECT(MACHINE(vms)), "virtio-mmio[*]",
+                                  OBJECT(dev));
+        sysbus_realize_and_unref(s, &error_fatal);
+        sysbus_mmio_map(s, 0, base);
+        sysbus_connect_irq(s, 0,
+                           qdev_get_gpio_in(vms->parent_obj.l2vic, irq));
+        vms->virtio_mmio[i] = dev;
+    }
+}
 
 void hexagon_load_fdt(const HexagonVirtMachineState *vms)
 {
@@ -246,6 +272,8 @@ static void virt_init(MachineState *ms)
 
     fdt_add_hvx(vms, m_cfg);
 
+    create_virtio_devices(vms);
+
     g_autofree HexagonCPU **cpus = g_new(HexagonCPU *, ms->smp.cpus);
 
     for (int i = 0; i < ms->smp.cpus; i++) {
-- 
2.34.1